Kerf Calc
The field calculator that shows its work.
Kerf Calc is the offline construction field calculator that just works — no account, no subscription. Punch feet-inch-fraction dimensions like a tape, then run rafters, stairs to code, concrete, rebar, roofing, drywall and more — each tool shows the exact formula and the code it cites (IRC, ASTM, NIST, ACI).
What's inside
Feet-inch-fraction tape math, down to 1/64
Framing: rafters, stairs to IRC/IBC code & pitch
Concrete, rebar, roofing, drywall & materials
Shows the formula and the code it cites · 100% offline
No account, no tracking, no data collection. Kerf Calc works fully offline.
Questions
Does Kerf Calc work offline?+
Yes. Kerf Calc runs entirely on your device, so it works with no internet connection.
Is there an account or subscription?+
No. There's no sign-up, no login, and no subscription — just download Kerf Calc from the App Store and open it.
What data does Kerf Calc collect?+
None. It collects, stores, and transmits zero personal data — nothing ever leaves your device.
Which devices are supported?+
Kerf Calc is available for iPhone, iPad & Mac.
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Get Kerf Calc
The field calculator that shows its work. On-device, no account, no tracking.
Download on theApp Store